Pipe coupling



Sept. 7, 1948. F, E, SWAIN 2,448,747

PIPE COUPLING l Filed April 5, 1945 Patented Sept. 7, 1948 PIPE COUPLINGFrank Edward Swain, Ewell, England, assignor of one-half to DouglasDarby, Northwood, Middlesex, England Application April 3, 1945, SerialNo. 586,384 In Great Britain January 12, 1945 3 Claims.

The main object of the present invention is to provide an improvedmethod of, and means for, securing a hollow adaptor or other rigidmember in the end of a rubber or like flexible hose, which may, ifdesired, be reinforced with fabric, wires or the like.

A further object is to ensure that the rubber will not spew out at theend of the hose when the said rigid member is secured inpositionparticularly in the case of a flexible hose which is reinforcedexternally in the manner described in my application No. 569,947, filedDecember 27,

1944, now Patent No. 2,424,863, where there is a tendency for the rubberto spew out between the part-spherical washers at the end and thereby tospread them.

In the accompanying drawings:

Figure 1 is a sectional elevation of one construction according to theinvention;

Figure 2 is an elevation of an alternative form of rigid sleeve; and

Figure 3 is a cross-section of a circlip when used instead of thefwasher of Figure 1, Figure 4 being an end elevation thereof.

The method of the invention broadly involves securing on to the end ofthe hose I4 a rigid sleeve I2 having a ange I5 abutting the end of thehose but not extending radially inwardly as far as the bore of the hosewhen the latter is undeformed, providing a screw-thread 2|I on thesurface of the hollow adaptor or other rigid member yIl, screwing thelatter into the end of the hose, and using a circlip 23a or a Washer 2,3with a tapped hole acting between the axially-inner face of the flangeI5 of the sleeve I2 and a wall of a groove 22 in the Iperiphery of themember I1 axially to locate the latter.

In a preferred construction the rigid sleeve I2 is secured on the end ofthe hose by being screwed thereon, this screw-thread being of oppositehand to the screw-thread 2l provided on the periphery of the rigidmember I1. Purchase can therefore be provided between these two ,partswhen the said rigid member is being screwed into position. Obviously,the said rigid member will be given a tapered end to facilitate itsentry into the bore of the hose-end.

Referring now to the drawings in greater detail, in Figure l the rigidsleeve Ia2 is provided with a screw-thread I 3 kby means of which it canbe screwed upon the end of the flexible hose I4 until its nange I5 abutsthe en-d of the flexible hose. The latter is externally reinforced inthe manner disclosed in the application above-mentioned, I6, I6representing some of the partspherical reinforcing washers. 'I'he rigidmember Il, which in this case is hollow and is provided 'with a head I8to receive an attachment nut indicated at I9, has a tapered inner end 20and a screw-threaded external periphery 2l, the screw-thread terminating`adjacent a peripheral groove 22 provided in the member fl 1- which, itwill 4be observed, is a sliding rlt inthe bore of the flange I5.Furthemore, the latter does not extend radially inwardly as far as thebore of the flexible hose when the latter is uncompressed.

The thread 2| is, as stated, of opposite han to the thread I3.

In the construction of Figure 1, for axial 1ocation purposes use is madeof a washer 23 which is inserted at or in the end of the bore of theflexible hose before the sleeve I2 is secured to the end of the hose.The hole of the washer is tapped, as shown ai; 24, to receive thescrewthrea'd 2l. In consequence, the member I 'I can be screwed throughthe washer into the bore of the exible hose, thereby compressing thematerial of the latter against the internal `periphery of the sleeve l2until the washer reaches the peripheral groove 22. Thereupon furtherrotation of the member I'I in the same direction will tend to draw thematerial of the hose axially in the direction of the arrows 25. Thiswill assist in increasing the compression of the material of the end ofthe hose and in causing it to spew completely throughout the interior ofthe sleeve I2, i. e., right up to the iiange I5. The washer, being oflarger diameter than the bore of the flange I5, interacts between thevaxially-inner face thereof and the opposite Wall of the peripheralgroove 22 to prevent the axial withdrawal of the member I'I.

To facilitate screwing the latter into position as aforesaid, the sleeveI2 may be provided with a hexagonal or other non-circular'periphery, asindicated at 26 in Figure 2.

In the alternative of Figures 3 and 4, the circlip 23a having a gap 28in it can be inserted into the interior of the sleeve I2 before this issecured to th'e end of the hose or, alternatively, if preferred, it maybe compressed and inserted through the bore of the flange I5 after thesleeve has been secured in position. Its inner periphery is providedwith -a sharp-edged ridge 29 which is shaped so as to engage thescrew-thread 2l of the member I1 when this is being screwed through it,in which conditions the circlip will, as will be well understood, adopta helical shape dependent upon the pitch of the screw-thread 2|. Whenthe member I1 has been completely screwed into position to bring theoirclip into engagement with its peripheral groove, which in this caseis of slightly less axial dimension than the corresponding groove 22 ofFigure 1, in order just to receivefthe circlip, the latter providesaxial location for the member I1 against withdrawal.

As will be Well understood, it is preferable to make use of anappropriate lubricant when screwing on the sleeve l2 or when screwing-in the member I1.

What I claim as my invention -d'desire to secure by Letters Patent ofthe United States is:

1. In combination with the end of a :flexible hose, a rigid sleevescrewed thereon,` said sleeve havingv a flange abutting the end offthehose but not extending radially inwardly as far as the bore of the hosewhen uncompressed, a rigidmember screwed into the endof the hose, thescrewthreads' of said sleeve and member being of op- -psite hands, andaring the internal periphery 4lof'which is shaped to receive thescrew-thread on said member, said ring disposed in the end of the-hoseendinteracting between the axially-innerv face 'of said flange anda peripheral 'groove of said member.

' 2.?Inl combination with the "end of a exible ":h'oseya rrigidsleeve-screwed thereon, said sleeve having'a flange abutting the end ofthehose but' ln'otextending radially inwardly as far as the bore of thehose wh'en uncompressed, a rigid' member Screwed vinto the'en'd' of thehose, the screwliollowrneirlberfscrewed into the end of th'e hose andextending through the opening of said flange with a sliding fit, thescrew-threads of said sleeve and member being of opposite hands wherebyby turning said sleeve and member with respect to one another th'e hoseend can be drawn in to fully occupy all the space between said sleeveand member. v g

"FRANK EDWARDSWAIN.

REFERENCES CITED The following references are of recordv in the `ille ofthis patent:

= UNITELD STATES PATENTS jNumber Name Datel y 806,135 Greenfield 'Dec.5, 1905 2,314,890 Melsom Mar. V30,1943 2,333,349 Weatherhead 'Nov. 2,1943 2,401,921 Fisher June 11, 1946

